{ pkgs ? import (fetchTarball https://github.com/NixOS/nixpkgs/archive/19.09-beta.tar.gz) {} }:
let
  easy-ps = import (pkgs.fetchFromGitHub {
    owner = "justinwoo";
    repo = "easy-purescript-nix";
    # rev = "b2efbe30c55ffa16dd6f85cb7c71f77ac3136aa0";
    # sha256 = "0mmjvqpkns964sjkbw0waqb47vfhg9r0fp9y0b5pizpikmw3fbp2";
    rev = "ab6c0a0518d14f68d0684344219959642adf4355";
    sha256 = "11skjldl28vlmm48bqza4b7bmly3dlppvha036nkgljkihqs69w7";
  }) { inherit pkgs; };
in pkgs.mkShell {
  buildInputs = [ easy-ps.purs
                  easy-ps.spago
                  pkgs.nodePackages.parcel-bundler
                  pkgs.nodejs
                ];
}